Die and die holder for the hot extrusion of metals



April 20, 1954 R. HEINTZ ET AL DIE AND DIE HOLDER FOR THE HOT EXTRUSIONOF METALS Filed Jan. 21, 1953 [Ir vrnfa hr 1!; 0/},

fiqh e/ai ll w .11; WF M' Patented Apr. 20, 1954 1.

DIE AND DI'E'HOLDER FOR THEHOT EXTRUSION OF METALS --:Ren:.Heintz,@Berlaimont (Nor-d), and JeansDel- .zcroix, .LIsle-Adam,France, assignors to Comp- .toir .Industriel dfEtirage et Profilage deMetaux,

" Paris, France, a corporation of France Applications] anuary 21, 1953,Serial No. 332382 -.Claims ,priority, application France .January 28,1952 3 Claims." (Cl. 207-17) 'The 'presentinvention relates to the hotex trusion ofmetalsih an eatrusionpress. I

It is known that this operation is-oarried out by placing a billet'orthe metal to be extruded inside-a container open at -both'ends andby'presjsing on said billet means of-a ram entering one end of thecontainer,-thereby forcing the metal to pass through a die arrangedatthe other end.

Thisoperation, suchas-normally and common- 1y effected, makesitnecessary to leave in the container of the ext'rusiom press, atthe-end of the operation, a certain length of the billet usually calleda discard.

In order that' th'e extruded product may be disengagedfrom the die, itis nec'essary to separate the discard 'from the rest or the-product.Several methods have been proposed and used thereforeamongst which -thefollowing -may be mentioned: (w) If the's'hape f the die and dieho'lderare suitable, for instance "if the face which isturned towards theinside of the container is plane, the discard may be cut-off, afterseparating from the container the assembly consisting "of the die,theextruded product and-the discard. possibility, howevergis limitedtenon-ferrousmetails and products with simple cross sections.

(b) It is also possible,after having removed the above mentionedassembly from the con tainer, to pull the :d iscard out of the die byclamping it in a vise and pulling it backwards, for

disengaging a small part of theextruded product, which is then cut:o'fi.' "-Ihis methodfihowever, is liable to cause-trouble, particularlywhen the discards to be removed are -thin or lubrication is defective. r

(a). At the end of *the extrusion operation, the extruded product may beout, (beyondthe-die, outside of-the tools, the assembly "formed ofthediscard and the. die may be moved away from the press; and these:twoparts-may be separated fromeach other outside th'e press byanyknown. means; Thex'press "is thus rapidly available for the "nextoperation, but such a method offers numerous-technicaldisadvantages.

id) The discard" may also :be made to adhere to the container, "afterwhich the die and the containerare separated from each'other; thusfreeing a part of the extrudedproduct which may then becu-t ofi.

(e) Finally-astudmay bezprovided on the=working face of the ramor'zdummy blockiplaced ahiead However, all these methods'havethedisadvantage of substantially slowing down the rate of production. Mostoften, the various operations describedare carried outon'thepressitself,and

should be finished before it isjpossible'to pass on to the nextextruding operation. Further, when any trouble occurs, which preventsthe releasing of the die, such as, for instance, theseizing of theextruded product or discard'again'stthedie, the

operation of the press has to be stopped untilv the tools have beenfreed.

An object of the invention is to providemeans to do away with thedisadvantages of the "above mentioned methods 'by'providing a specialconstruction for the die-carrier or holder, i. e. the member holding thedie at one end of the container, and formingat the 'same time-aremovable wall closing the said end.

A die holder according to the invention comprises two coaxial memberseach corresponding to a part-of the height ofthe die, and fitting intoeach other, at least one of said members forming a 'wall for thecontainer at the end thereof at which the die is arranged. Thisdie-holder assembly has been provided with an axial, frustoconicalboring "the wall generatrices of which converge towards the face of thedie-holder which applies on the container, and are inclined on the axisof the die-holder by an angle which is slightly greater than the seizingangle of the metal ormetals forming the die holder and die, thesa-idboring being designed toreceive the die which has a correspondingouter surface, a counter-die or the like being provided for holding thedie in the said-holder; 7

An embodiment of the device according to the invention has been shownbyway of example in theaccompanying drawings, in which:

Fig/1 is a diametral sectional view of adieholding block comprising a.two-member die holder, a die and a counter-die.

Fig. 2 is a similar view showing an extruded bar at the end oftheextruding operation,-the two die-hol'der"members having been movedaway from each other. 1 Y

Fig. 3 'is a: similar view, the block still being compact. p

Referring to the d rawings, the dieholder A, which applies-at the endoff-the container 0, compris'es'two members I an'd Z, madeof steel,assembled by conical fitting. 'Mem'b'er 1 corresponds to the portion ofthe die-holderwhiehapplies on the container and closes the end thereof."In this assembly, there is provided a 'frusto-con'ical bore3;thexzgeneratrices of which converge towards'the free face .of member I,and' are inclinedon the axis of the bore, by an angle slightly greaterthan 9", which is the value of the seizing angle of steel. The die 4 hasa-corresponding outer surface which allows it to fit into the bore 3. Itis held in the said bore 3, during the extruding operations, by acounter-die 5 provided with a central recess 6 for the passage of theextruded product.

With an extrusion press provided with such a die holder, two differentmanners of operating may be used for separating the discard from theextruded product at the end of an extrusion operation.

As shown in Figure 2, member I of the dieholder may be held by anysuitable means, against the container and part 2, be moved away axially,the die 4 and counter-die 5 thus being carried away. The discard 8 isheld by the mem,

ber l on Which it bears and the drawn bar 8 is sawn ofi in the plane S.The assembly formed by the member I and the discard l is removed fromthe container, the separation of said assembly offering no difiicultysince the discard 1 simply rests against member I, and in anotheroperation which may take place outside the press, the die 4 can beseparated from the extruded bar 8.

It will be realized that instead of moving member 2 with respect tomember I, the container being motionless, member 2 could just as well beheld fixed and the container and member I moved away axially from member2, which amounts to the same thing.

One may also, as shown in Figure 3, saw the drawn bar 8 in the plane Sbeyond the counterdie 5, remove from the press the whole assembly formedof members I, 2, of the die 4 and of the discard I, separate member Ifrom member 2 by means of an auxiliary apparatus, and then separate, onthe one hand, the discard 1 from member I and, on the other hand, thedie from member 2.

The device of the invention thus makes it possible to separate withoutdifiiculty the discard and the extruded product from the die and dieholder, even in cases where this operation is difficult such as in thecase of a thin discard, of a discard jammed in the die-holder or in thedie, or of an extruded product jammed in the die.

The present invention also has the advantage of reducing the duration ofa complete extrusion operation, on the one hand by avoiding the aboverecalled troubles and on the other hand in a still more marked manner,by making it possible to separate the discard from die holder outsidethe press and by eliminating the necessity of passing back the extrudedproduct through the die, which always is a delicate operation whendealing, for instance, with products which have been extruded at a hightemperature, using glass as'a' lubricant.

What we claim is:

1. In a press for the hot extrusion of metals, comprising a containeradapted to receive a billet of the metal to be extruded, and having twoopen ends, a die holder comprising a first annular metal member havingtwo faces, one of which is shaped for fitting tightly into one of saidopen ends of said container thereby partly closing said end, and a firstaxial bore with a frustoconical wall, the narrowest end of which lies onthe side of said face which fits in the container, a recess in the faceof said first annular member which is opposite that which fits into thecontainer, and surrounding said first axial bore, and a second metalannular member, adapted to fit into said recess, having a second axialbore with a frusto-conical wall adapted to extend the wall of the firstaxial bore in said first annular member when said first and secondannular members are fitted into each other, an extrusion metal diehaving a frusto-conical outer wall, the frustoconical surfaces formed bythe walls of said bores in said first and second annular members and bythe outer wall of said die having a same apex angle slightly greaterthan the seizing angle of the metal forming the die and the metalforming said first and second annular members, and a member adapted tohold the die in the bores in said annular members when said annularmembers are fitted into each other.

2. In a press for the hot extrusion of metals, comprising a containeradapted to receive a billet of the metal to be extruded, and having twoopen ends, a die-holder comprising a first annular metal member, havingtwo faces, one of which is shaped for fitting tightly into one of saidopen ends of said container, thereby partly closing said end, and afirst axial bore with a frustoconical wall the narrowest end of whichlies on the side of said face which fits in the container, a recess inthe face of said first annular member which is opposite that which fitsinto the container, and surrounding said first axial bore, said recesshaving a frusto-conical inner side wall, flaring towards the face ofsaid first member which is opposite that which fits in the container,and a second annular metal member having an extension with afrusto-conical side wall adapted to fit into said recess, and having asecond axial bore with a frusto-conical wall adapted to extend the wallof the first axial bore in said first annular member when said first andsecond annular members are fitted into each other, a metal extrusion diehaving a frusto conical outer wall, the frusto-conical surfaces of thewalls of said bores in said first and second annular members and of theouter wall of said die having the same apex angle slightly greater thanthe seizing angle of the metal forming the die and the metal formingsaid first and second annular members, and a member adapted to hold thedie in the bores in said annular members when said annular members arefitted into each the remainer of said face is bevelled inwardly and endsin a first axial bore with a frustoconical wall, the narrowest end ofwhich lies on the side of said face which fits into the container, arecess in the face of said first annular member which is opposite thatwhich fits into the container, and surrounding said first axial bore,and a second annular metal member having an extension with afrusto-conical side wall adapted to fit into said recess, and having asecond axial bore with a frusto-conical wall adapted to extend the wallof the first axial bore in said first annular member when said firstandsecond annular members are fitted into each other, a metal extrusion diehaving a frusto-conical outer wall. the frusto-conical surfaces of thewalls of said bores in said first and second annular members 2,675,915 56 and the outer wall of said die having the same Number Name Date apexangle, slightly greater than the seizing angle 1,769,205 Clark July 1,1930 of the metal forming the die and the metal form- 1,847,365 SkinnerMar. 1, 1932 ing said first and second annular members, and. 2,172,867Dreyer Sept. 12, 1939 a member adapted for holding the die in the 52,491,897 Lorant Dec. 20, 1949 bores in said annular members when saidannular members are fitted into each other. FOREIGN PATENTS NumberCountry Date References Cited in the file of this patent 598,861 FranceDec. 28, 1925 UNITED STATES PATENTS 10 83.068 France un 5, 1930 NumberName Date 1,395,217 Begot Oct. 25, 1921

